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SEM micrographs of (a) glass-ceramics of the CaO–P2O5–Na2O–SrO–ZnO system sintered at 650 °C for 4 h, (b) the samples after treatment by HCl solution at pH 1.0 for 2.5 min, (c) pH 3.0 for 2.5 min, (d) pH 10.0 for 2.5 min, and (e) pH 10.0 for 10.0 min. Reproduced with permission from Reference [49].
